Abstract
A shipboard gamma-ray measurement system equipped with a 7.6 cmØ × 7.6 cm NaI(Tl) detector for remote real-time radioactivity monitoring of gamma-ray emitting radionuclides in surface seawater is presented. The full energy peak detection efficiency of the detector to convert measured gamma-ray counts to radioactivity concentration was estimated using Monte Carlo simulation with the MCNP code. The detection efficiency calibration was validated by sampling and laboratory analysis for 40K in seawater from the site where the ship with the measurement system stayed. The minimum detectable activity of this measurement system for 131I, 134Cs and 137Cs in seawater with the varied spectrum accumulation time is discussed.
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